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Posted to commits@subversion.apache.org by sv...@apache.org on 2015/09/06 06:00:09 UTC
svn commit: r1701439 - in /subversion/branches/1.8.x: ./ STATUS subversion/
subversion/mod_dav_svn/reports/log.c
Author: svn-role
Date: Sun Sep 6 04:00:08 2015
New Revision: 1701439
URL: http://svn.apache.org/r1701439
Log:
Merge the r1666965 group from trunk:
* r1666965, r1667120
Reduce 'the lag' of the first svn log results over mod_dav.
Justification:
A slow svn log makes users call Subversion slow. This fixes the
perceived performance problem by no longer optimizing just for
obtaining all the results fast, but also for obtaining the first
result fast.
.
Just the perceived slowness of common svn log operations might
make users switch to a DVCS or implement a client side cache,
while this slowness is just a buffering to make the total set of
results come in faster. But I don't think there are that many users
that really wait for all results of
.
$ svn log -q ^/subversion/trunk
.
This currently takes > 10 seconds before the first result using
the EU mirror for me. With --limit 1 (best comparison with post-patch)
that would be 0.2 seconds.
Votes:
+1: rhuijben, philip, brane
-0.5: ivan (It's not security or bug fix. The change itself a little
bit controversial for me, so it's better to release it as
part of Subversion 1.9.0)
Modified:
subversion/branches/1.8.x/ (props changed)
subversion/branches/1.8.x/STATUS
subversion/branches/1.8.x/subversion/ (props changed)
subversion/branches/1.8.x/subversion/mod_dav_svn/reports/log.c
Propchange: subversion/branches/1.8.x/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Sun Sep 6 04:00:08 2015
@@ -148,5 +148,5 @@
/subversion/branches/uris-as-urls:1060426-1064427
/subversion/branches/verify-at-commit:1462039-1462408
/subversion/branches/wc-collate-path:1407642
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/subversion/trunk/subversion/tests:1652182
Modified: subversion/branches/1.8.x/STATUS
URL: http://svn.apache.org/viewvc/subversion/branches/1.8.x/STATUS?rev=1701439&r1=1701438&r2=1701439&view=diff
==============================================================================
--- subversion/branches/1.8.x/STATUS (original)
+++ subversion/branches/1.8.x/STATUS Sun Sep 6 04:00:08 2015
@@ -74,28 +74,3 @@ Veto-blocked changes:
Approved changes:
=================
-
- * r1666965, r1667120
- Reduce 'the lag' of the first svn log results over mod_dav.
- Justification:
- A slow svn log makes users call Subversion slow. This fixes the
- perceived performance problem by no longer optimizing just for
- obtaining all the results fast, but also for obtaining the first
- result fast.
- .
- Just the perceived slowness of common svn log operations might
- make users switch to a DVCS or implement a client side cache,
- while this slowness is just a buffering to make the total set of
- results come in faster. But I don't think there are that many users
- that really wait for all results of
- .
- $ svn log -q ^/subversion/trunk
- .
- This currently takes > 10 seconds before the first result using
- the EU mirror for me. With --limit 1 (best comparison with post-patch)
- that would be 0.2 seconds.
- Votes:
- +1: rhuijben, philip, brane
- -0.5: ivan (It's not security or bug fix. The change itself a little
- bit controversial for me, so it's better to release it as
- part of Subversion 1.9.0)
Propchange: subversion/branches/1.8.x/subversion/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Sun Sep 6 04:00:08 2015
@@ -148,4 +148,4 @@
/subversion/branches/uris-as-urls/subversion:1060426-1064427
/subversion/branches/verify-at-commit/subversion:1462039-1462408
/subversion/branches/wc-collate-path/subversion:1407642
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+/subversion/trunk/subversion:1467440,1467450,1467481,1467587,1467597,1467668,1467675,1467803,1467807,1467951,1468109,1468116,1468151,1468347,1468395,1468439,1468487,1468565-1468566,1468980,1469248,1469363,1469478,1469489,1469512-1469513,1469550,1469556,1469645,1469674,1469833,1469862,1469866,1469871,1469994,1470031,1470037,1470221,1470238,1470246,1470248,1470537,1470650,1470738,1470781,1470898,1470904,1470908,1470913,1470936,1470993-1470994,1471028-1471029,1471107,1471153,1471302,1471443,1471490,1471744,1475704,1475724,1475772,1475963,1476092,1476155,1476181,1476193,1476254,1476359,1476366,1476607,1477294,1477359,1477729-1477730,1477876,1477891,1478001,1478220-1478221,1478465,1478617,1478897,1478951,1478987,1478998,1479320-1479321,1479323,1479326,1479329,1479540,1479563,1479605,1479896,1480054,1480077,1480080,1480082,1480119,1480149,1480344,1480412,1480426,1480442,1480616,1480641-1480642,1480664,1480669,1480681,1480723,1480738,1480765,1481010,1481418,1481594,1481596,1481625,1481627-
1481628,1481631-1481632,1481772,1481782,1481800,1481813,1481847,1481944,1481981,1482282,1482327,1482338,1482350,1482354,1482436,1482479,1482524,1482528,1482536,1482554,1482558,1482592,1482724,1482759,1482779,1482829,1482969-1482970,1482973,1483015,1483077,1483101,1483116,1483125,1483391,1483397,1483555,1483557,1483575,1483580,1483781,1483927,1483939,1483947,1483964-1483965,1483968,1483972,1483975,1483977,1483984,1484006,1484016-1484017,1484023,1484755,1485018,1485127,1485350,1485413,1485427,1485447,1485449,1485497,1485501,1485650,1486072,1486457,1486572,1486809,1486915,1486931,1487083,1487094,1488183,1488267,1488294,1488425,1488639,1488693,1488878,1489114,1489116-1489117,1489203,1489339,1489935,1490045,1490326,1490679,1490684,1490721,1491432,1491499,1491707,1491739,1491755-1491756,1491762,1491770,1491816,1491868,1492005,1492020,1492145,1492148,1492152,1492164,1492264,1492295,1493102,1493424,1493475,1493703,1493720,1493951,1494089,1494171,1494223,1494287,1494298,1494318,1494342,14946
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875,1579274,1579429,1579588,1579684,1580626,1580650,1580832,1580867,1580872,1581296,1581305,1581315,1581430,1581810,1583580,1583977,1584342,1584576,1584592,1584745,1585686,1586052,1586255,1586352,1586467,1587511,1587946,1587968,1588772,1588778,1589184,1589188,1589360,1589460,1589486,1590212,1590751,1591123,1592014,1592034,1592987,1593992,1594156,1594223,1594794,1594814,1594834,1595061,1595431,1596866,1597884,1600311,1600315,1600323,1600331,1600348,1600368,1600393,1600563,1600781,1600909,1601851,1606009,1611379-1611381,1612225,1612405,1615211,1615219,1615255-1615256,1615260,1615263,1615354,1616131,1617687,1618472,1618841,1619071,1619105,1619118,1619153,1619774,1619802,1620332,1621978,1621981,1625522,1625533,1625537,1628431,1628536,1628540,1632635,1633126,1636874,1637826,1640730,1640832,1640862,1640873,1641564,1643033,1643074,1643409,1643437,1643457,1643461,1643482,1643793,1643810,1643972-1643973,1644158,1644530,1644595,1644599,1646230,1646250,1646253,1646495,1646505,1646785-1646786,1
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Modified: subversion/branches/1.8.x/subversion/mod_dav_svn/reports/log.c
URL: http://svn.apache.org/viewvc/subversion/branches/1.8.x/subversion/mod_dav_svn/reports/log.c?rev=1701439&r1=1701438&r2=1701439&view=diff
==============================================================================
--- subversion/branches/1.8.x/subversion/mod_dav_svn/reports/log.c (original)
+++ subversion/branches/1.8.x/subversion/mod_dav_svn/reports/log.c Sun Sep 6 04:00:08 2015
@@ -65,6 +65,10 @@ struct log_receiver_baton
/* whether the client can handle encoded binary property values */
svn_boolean_t encode_binary_props;
+
+ /* Helper variables to force early bucket brigade flushes */
+ int result_count;
+ int next_forced_flush;
};
@@ -275,6 +279,41 @@ log_receiver(void *baton,
SVN_ERR(dav_svn__brigade_puts(lrb->bb, lrb->output,
"</S:log-item>" DEBUG_CR));
+ /* In general APR will flush the brigade every 8000 bytes through the filter
+ stack, but log items may not be generated that fast, especially in
+ combination with authz and busy servers. We now explictly flush after
+ log-item 4, 16, 64 and 256 to produce a few results fast.
+
+ This introduces 4 full flushes of our brigade and the installed output
+ filters at growing intervals and then falls back to the standard
+ buffering of 8000 bytes + whatever buffers are added in output filters. */
+ lrb->result_count++;
+ if (lrb->result_count == lrb->next_forced_flush)
+ {
+ apr_status_t apr_err;
+
+ /* This flush is similar to that in dav_svn__final_flush_or_error().
+
+ Compared to using ap_filter_flush(), which we use in other place
+ this adds a flush frame before flushing the brigade, to make output
+ filters perform a flush as well */
+
+ /* No brigade empty check. We want output filters to flush anyway */
+ apr_err = ap_fflush(lrb->output, lrb->bb);
+ if (apr_err)
+ return svn_error_create(apr_err, NULL, NULL);
+
+ /* Check for an aborted connection, just like our brigade write
+ helper functions, since the brigade functions don't appear to
+ be return useful errors when the connection is dropped. */
+ if (lrb->output->c->aborted)
+ return svn_error_create(SVN_ERR_APMOD_CONNECTION_ABORTED,
+ NULL, NULL);
+
+ if (lrb->result_count < 256)
+ lrb->next_forced_flush = lrb->next_forced_flush * 4;
+ }
+
return SVN_NO_ERROR;
}
@@ -421,6 +460,9 @@ dav_svn__log_report(const dav_resource *
lrb.stack_depth = 0;
/* lrb.requested_custom_revprops set above */
+ lrb.result_count = 0;
+ lrb.next_forced_flush = 4;
+
/* Our svn_log_entry_receiver_t sends the <S:log-report> header in
a lazy fashion. Before writing the first log message, it assures
that the header has already been sent (checking the needs_header